A new fault phase identification method based on phase current difference

作者：Ma Jing^*; Wang Xi; Wang Zengping

来源：Proceedings of the CSEE, 2012, 32(19): 117-124.

• Fault resistances
• Fault types
• High sensitivity
• Line currents
• Load currents
• Low sensitivity
• Phase currents
• Phase identification
• Protection device
• Simulated results
• Single fault
• Weak infeed

In accordance with the problems that single fault phase identification method existed can not identify all types of fault and the phase current difference identification devices had a low sensitivity in the weak infeed condition, a new type of fault phase identification method based on phase current difference was proposed in this paper. This fault phase identification method firstly used fault current measured at the protection devices setting place only to establish the fault phase identification factors based on the proportion relationship between the faulted phase current and the faulted line current. Then, the faulted phases can be identified fast and accurately by the different mathematical characteristics of fault phase identification factors in each fault types. Simulated results show that the proposed fault phase identification method can identify any types and phases of faults in a cycle and has a high sensitivity. Furthermore, the method which has high capability is not affected by the fault location and fault resistance and load current. It is also of interest to point out that this fault phase identification method has the capability of identifying the developing fault. Meanwhile, the method could work in the weak infeed conditions and has sufficient sensitivity.

• 出版日期2012
• 单位华北电力大学